I think it'll depend on how your brows are naturally - whether the hairs are thick or fine, if your brows are naturally sparse or not, what the natural shape of your brows are, etc.
I have fine eyebrow hairs that are pretty sparse, but my brows themselves cover a pretty wide area, especially on the ends, so I thread them pretty regularly to keep them shaped. The hairs grow back annoyingly fast for me, in the same shape as before, even though I thread them every week because the regrowth starts getting noticeable. My brows are also a lot lighter than my hair, so I fill them in with black eyeshadow if I'm not going makeup free for the day.